Some concepts about measurement Some concepts about measurement Some concepts about measurement Some concepts about measurement Some concepts about measurement Some concepts about measurement
1. quantity: the attribute of a phenomenon, an object or a substance, which can be qualitatively distinguished and quantitatively determined.
Quantity can be divided into countable quantity and measurable quantity. It consists of two parts: numerical value and unit of measurement.
2. Measurement: all operations aimed at determining the value of the measured object. Divided into direct measurement and indirect measurement.
3. Measurement: an activity to achieve unity of units and accurate and reliable values. It has four characteristics: accuracy, consistency, traceability and legitimacy. Among them, accuracy is the most important, the core and the soul. Accuracy refers to the consistency between the measured results and the measured true values.
4. Metrology: the science of measurement. Divided into scientific measurement, engineering measurement and legal measurement.
5. Measuring instrument: It can be used to measure the measured object directly or indirectly.
Devices, instruments, measuring tools and reference materials used to unify numerical values, including measurement standards, measurement standards and working measurement standards. Divided into standard instruments, standard instruments and working instruments. The basic task of measurement management is to independently manage measuring instruments according to law.
6. Metrological benchmark: a physical measuring tool, measuring instrument, reference substance or measuring system used as a reference in order to define, realize, save or reproduce one or more values of a unit of quantity. It is divided into national benchmark, sub-benchmark, working benchmark and measurement benchmark. Mast benchmark: The measurement standard is appraised and approved by the state as the highest basis for unifying national values.